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Optimize XIData pickle fallback: up to 17x slower than ProcessPoolExecutor for mutable containers

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148072 In python/cpython;

· jrfk opened on Apr 4, 2026

small typo in asyncio-eventloop.html

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#148067 In python/cpython;

· iacore opened on Apr 4, 2026

ast.compare in "Compiler flags" section of Abstract syntax trees

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#148063 In python/cpython;

· hunterhogan opened on Apr 4, 2026

Refactor codegen_deferred_annotations_body to ensure mangled is decref'd

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#148059 In python/cpython;

· A0su opened on Apr 3, 2026

XMLParser.__init__() leaking refs when called twice

pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#148058 In python/cpython;

· maurycy opened on Apr 3, 2026

Check early whether tail-calling is possible for MSVC builds on Windows

buildThe build process and cross-buildThe build process and cross-build

OS-windows

Status: Open.

#148047 In python/cpython;

· chris-eibl opened on Apr 3, 2026

PyCode_Addr2Line shouldn't lock in free threaded Python

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

topic-free-threading

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#148037 In python/cpython;

· colesbury opened on Apr 3, 2026

sys.set_lazy_imports_filter loses information when doing relative imports

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

topic-lazy-imports

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#148026 In python/cpython;

· msullivan opened on Apr 3, 2026

Improve "Leading padding not allowed" error in Base32 and Base64 decoders

3.15new features, bugs and security fixesnew features, bugs and security fixes

extension-modulesC modules in the Modules dirC modules in the Modules dir

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148016 In python/cpython;

· serhiy-storchaka opened on Apr 2, 2026

Accept a function (module_name:function_name) in -X presite and PYTHON_PRESITE

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148014 In python/cpython;

· vstinner opened on Apr 2, 2026

Publicly expose shutil.ReadError and shutil.RegistryError

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148001 In python/cpython;

· WYSIATI opened on Apr 2, 2026

Avoid memory leak in _pop_preserved()

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#147998 In python/cpython;

· maurycy opened on Apr 2, 2026